20569979430 has 1024 divisors, whose sum is σ = 80750960640. Its totient is φ = 3613040640.

The previous prime is 20569979429. The next prime is 20569979461. The reversal of 20569979430 is 3497996502.

20569979430 is a `hidden beast` number, since 2 + 0 + 56 + 99 + 79 + 430 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 555945372 + ... + 555945408.

It is an arithmetic number, because the mean of its divisors is an integer number (78858360).

Almost surely, 2^20569979430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20569979430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40375480320).

20569979430 is an abundant number, since it is smaller than the sum of its proper divisors (60180981210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20569979430 is a wasteful number, since it uses less digits than its factorization.

20569979430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

It can be divided in two parts, 20569 and 979430, that added together give a palindrome (999999).

The spelling of 20569979430 in words is "twenty billion, five hundred sixty-nine million, nine hundred seventy-nine thousand, four hundred thirty".